I think it is unfair of you to take an incident involving a male security guard and use that to argue that women have this attitude towards men.
I do however agree that there is a horrible attitude, generally, towards men in relation to their interaction with children.
Stay away from children, stay away from the park, avert your eyes in the swimming pool, don't play with the kids, don't come to the aid of a lost child...
Oh, and be a fully involved, hands on, possibly psychic husband and father.
That's unfair. It's wrong and it should stop. Men are not monsters, waiting for a chance to get hold of a 'kiddie' (to go all Daily Mail)
However, I think you'll find in terms of unfairness, assumptions, prejudice and restrictions - women have it a lot worse.
default setting for childcare, housework, cooking...
damned if you do damned if you don't SAHM
lower pay
worse conditions
statistically much more at risk of DV
shall I go on?